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Right now genx does output to a FILE *. Several have suggested that it
should do output via an abstracted callback. This sounds kind of
seductive, and is indeed much more general, and would be no biggie to
implement, but the more I think about it the less I like it. So at the
moment I'm leaning to sticking with FILE * for the following reasons:
1. The sweet spot for XML is interchange, and FILE * is a nice general
basis for almost all kinds of interchange.
2. If you're going to build an XML instance in memory, wouldn't it be
more natural to pull together a DOM or your own private data structure
and then serialize it in one fell swoop?
3. This lowers the barrier-to-entry to implementers, who are going to
see genxStartDocument(genxWriter w, FILE * file) and say "oh yeah I
know what to do" as opposed to having to figure out another flavor of
I/O abstraction and write a stub of some kind.
So this would be a good time to say "I'd use genx for XXX, but if it
sticks with FILE * I'm not going to be able to use it because of YYY".
-Tim
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